EP0572311A1 - Resistive Stromsonde - Google Patents

Resistive Stromsonde Download PDF

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Publication number
EP0572311A1
EP0572311A1 EP93401333A EP93401333A EP0572311A1 EP 0572311 A1 EP0572311 A1 EP 0572311A1 EP 93401333 A EP93401333 A EP 93401333A EP 93401333 A EP93401333 A EP 93401333A EP 0572311 A1 EP0572311 A1 EP 0572311A1
Authority
EP
European Patent Office
Prior art keywords
resistive element
current sensor
current
conductive
welded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93401333A
Other languages
English (en)
French (fr)
Inventor
André Marchand
Gilberte Jacquier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales Avionics SAS
Original Assignee
Thales Avionics SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thales Avionics SAS filed Critical Thales Avionics SAS
Publication of EP0572311A1 publication Critical patent/EP0572311A1/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistors
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits
    • H05K3/328—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits by welding

Definitions

  • the present invention relates to current sensors comprising a resistive element mounted on a support, means for supplying current to the resistive element, and means for measuring the voltage created by the current in the resistive element.
  • the present invention relates more particularly to current sensors manufactured using printed circuit technology, or that of hybrid circuits with a ceramic substrate.
  • a resistive current sensor 1 comprises a resistive element 2 having two ends 2a, 2b fixed by means of a weld 3 on conductive pads 4a, 4b of a circuit 10.
  • the resistive element 2 is arranged in series with a conductive track 5 leading to the pad 4a and extending after the pad 4b.
  • the conductive track 5 is traversed by a current I to be measured (or to be monitored).
  • the current I passing through the resistive element 2 creates a voltage V detected by means of two conductive tracks or measurement arms 6a, 6b, coming from the areas 4a, respectively 4b, and leading to any measurement (or detection) device 7 .
  • conversion resistance The value of the electrical resistance between the two measuring arms 6a, 6b will subsequently be called “conversion resistance” R, determining the conversion of the current I into the measured voltage V.
  • the resistive element 2 is generally made of a metal alloy having a resistivity substantially independent of temperature, so that the conversion resistance R is invariable in the temperature range in which the current sensor 1 operates.
  • Such alloys for example nickel-copper or nickel-copper-manganese alloys - are available from various manufacturers and are offered in various packaging, for example in ribbons, in bars, in wires, etc.
  • the resistive element 2 as shown in FIGS. 1A, 1B, is obtained from a ribbon of such an alloy .
  • the electrical resistance of the resistive element 2 is very low, of the order of a few milliohms, mainly in order to avoid excessive heat dissipation which would damage the solder 3.
  • FIG. 1B shows overflows 3a, 3b of the solder 3 which occur under the resistive element 2, during the melting of the solder 3.
  • This phenomenon known to those skilled in the art, has the effect of partially short-circuit the resistive element 2 in its useful part, located between ranges 4a and 4b, thus randomly decreasing the value of the conversion resistance R between the measuring arms 6a, 6b.
  • the value of the conversion resistance varies within a range of 8%.
  • the temperature variations of the conversion resistance R are much greater than what would be expected from the use of an alloy whose resistivity is not very sensitive to temperature. This fact is attributable to the influence of the resistivity of the solder 3 and that of the conductive material constituting the areas 4a, 4b. This phenomenon is very marked on hybrid circuits, in which the materials used for the conductive layers (Au; Pt Au; Pd Ag; W) have a resistivity of the same order of magnitude as that of the alloy constituting the resistive element 2, and very sensitive to temperature differences.
  • a current sensor device comprising a resistive element mounted on a support, means for supplying current to the resistive element, and means for measuring the voltage created. by the current in the resistive element, at least one of said means comprising conductive means connected to a region of the resistive element undisturbed by connection welds of the resistive element.
  • the conductive means are made in one piece with the resistive element, so that the resistance value of the latter cannot be adjusted.
  • An additional resistance is therefore used, which itself has its value adjusted by laser.
  • the known device is therefore expensive and complex to produce.
  • An object of the present invention is to overcome these drawbacks, and to make it possible to obtain a precision current sensor which is not very sensitive to temperature variations and which is relatively simple to produce.
  • Another object of the present invention is to allow the mass production of current sensors without dispersion of the values of the conversion resistance.
  • the invention firstly provides a device of the type mentioned above, in which said means are attached, in particular by welding, to the resistive element.
  • the temperature stability of the current sensor according to the invention only depends on the stability of the material constituting the resistive element.
  • said support comprises conductive pads to which the distal ends of said conductive means are connected respectively.
  • said conductive means are son welded ultrasonically to the resistive element.
  • the wires can thus directly connect the current sensor according to the invention to a device for measuring or detecting voltage, or conductive areas of the support.
  • said conductive means are rigid conductors electrically welded on the resistive element.
  • the current sensor according to the invention is characterized in that the resistive element is bonded to said support, and in that the means for supplying voltage and the means for measuring voltage each comprise wires soldered to the resistive element.
  • an alloy of metals chosen from the group constituted by copper, nickel and manganese will be chosen, for the production of said resistive element.
  • said support is chosen from the group consisting of printed circuits and hybrid circuits.
  • the invention also provides a method of manufacturing the above device, in which said conductive means are connected, in particular by welding, to the resistive element at a point chosen to give said element a predetermined resistance value.
  • the position in which the conductive means are brought back can in particular be adjusted by simultaneously measuring the resistance of the resistive element.
  • FIG. 2A represents a current sensor 50 according to the present invention.
  • the current sensor 50 comprises, like that of FIGS. 1A and 1B, a resistive element 2 welded by its ends 2a, 2b to areas 4a, 4b of a circuit 10, by means of a solder 3, the assembly being arranged in series with a conductive line 5 of the circuit 10.
  • the dots 3a and 3b of the weld 3 described in the preamble, located on the underside of the resistive element 2, are shown in dotted lines, near the areas 4a, 4b.
  • the current sensor 50 of the invention further comprises two electrical measurement wires, respectively 20, 30, welded to the upper face of the resistive element 2, the distal ends of the wires 20, 30 being respectively welded to areas of wiring 11,12 extending by conductive tracks 13,14 leading to a device 7 for measuring or detecting voltage.
  • the contact points 21, 31 of the wires 20.30 with the resistive element 2 are arranged beyond the zones of the resistive element 2 short-circuited by the solder 3 or by the overflows 3a, 3b welding 3.
  • the measurement wires 20.30 advantageously replace the measurement arms of the devices of the prior art, because the conversion resistance R of the sensor 50 of the invention, located here between the welding points 21, 31 of the wires of measure 20, 30, depends only on the resistivity of the material constituting the resistive element 2.
  • the temperature stability of the current sensor 50 only depends on the stability of the material constituting the resistive element 2, and resistive alloys of the nickel-copper or nickel-copper-manganese type will preferably be chosen.
  • a predetermined current Ip is injected into the resistive element 2, for example by means of test tips 40, 41 arranged on the conductive track 5 and connected to a current generator 45.
  • test tips 40, 41 arranged on the conductive track 5 and connected to a current generator 45.
  • test tips 42, 43 on the measurement ranges 11, 12, the tips 42, 43 being connected to a voltmeter 44.
  • a first wire 20 is welded between a measuring range 11 and the resistive element 2, by means of an ultrasonic wiring machine 46.
  • an arrow indicates the axis along which the search for the weld location is carried out.
  • FIG. 3 represents another embodiment of a current sensor 60 according to the invention, in which the method described above can also be used.
  • the resistive element 2 is glued to the circuit 10 by means of an insulating adhesive 15 preferably having good thermal conductivity.
  • the measurement wires 20, 30 and the measurement ranges 11, 12 described above are retained.
  • wires 65, 67 welded to the ends 2a, 2b of the resistive element 2, and connecting the resistive element to the conductive track 5 by means of pads of wiring 66, 68 on which the distal ends of the wires 65, 67 are welded.
  • the supply means and the measurement means can be reversed.
  • the measurement wires 20, 30 could be used for the power supply, and the areas 4a, 4b as measurement means; since the measurement of a voltage takes place with a practically zero current, the measurement would not be marred by errors due to variations in resistivity of the solder 3 and of the material constituting the conductive pads 4a, 4b.
  • supply wires 65, 67 could be used for the measurement, and the measurement wires 20, 30 for the current supply. In another alternative embodiment, one could also multiply the number of supply wires 65.67 in order to allow the passage of a larger current.
  • FIG. 4 shows an alternative embodiment of current sensors according to the invention, which can be manufactured before being mounted on a circuit.
  • the current sensor 70 of FIG. 4 comprises two rigid conductors 71, 75, for example made of copper, arranged perpendicular to the resistive element 2 and each welded at a point 72, 74 of the resistive element 2, by electrical welding.
  • the assembly formed by the resistive element 2 and the two conductors 71, 75 forms a component ready to be mounted or welded on the pads of a circuit, by the ends 2a and 2b of the resistive element 2 and the distal ends conductors 71 and 75.
  • the current sensor of FIG. 4 is particularly suitable for mass production while making it possible to obtain high precision as regards the conversion resistance.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP93401333A 1992-05-27 1993-05-25 Resistive Stromsonde Withdrawn EP0572311A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9206498A FR2691807B1 (fr) 1992-05-27 1992-05-27 Capteur de courant resistif.
FR9206498 1992-05-27

Publications (1)

Publication Number Publication Date
EP0572311A1 true EP0572311A1 (de) 1993-12-01

Family

ID=9430237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401333A Withdrawn EP0572311A1 (de) 1992-05-27 1993-05-25 Resistive Stromsonde

Country Status (2)

Country Link
EP (1) EP0572311A1 (de)
FR (1) FR2691807B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7170295B2 (en) * 2003-06-26 2007-01-30 Isabellenhutte Heusler Gmbh & Co. Kg Resistor arrangement, manufacturing method, and measurement circuit
CN117012482A (zh) * 2023-07-20 2023-11-07 钧崴电子科技股份有限公司 一种电阻元件及其集成电路

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568684A1 (fr) * 1984-08-03 1986-02-07 Telemecanique Electrique Dispositif de lecture de l'intensite d'un courant electrique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568684A1 (fr) * 1984-08-03 1986-02-07 Telemecanique Electrique Dispositif de lecture de l'intensite d'un courant electrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELEKTRONIK vol. 37, no. 9, Avril 1988, MUENCHEN,DE pages 126 - 132 JACQUES 'Platin-und Iridium-Dunnschichtmesswiderstaende' *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7170295B2 (en) * 2003-06-26 2007-01-30 Isabellenhutte Heusler Gmbh & Co. Kg Resistor arrangement, manufacturing method, and measurement circuit
CN117012482A (zh) * 2023-07-20 2023-11-07 钧崴电子科技股份有限公司 一种电阻元件及其集成电路

Also Published As

Publication number Publication date
FR2691807B1 (fr) 1997-04-25
FR2691807A1 (fr) 1993-12-03

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